楔形H型钢短柱循环荷载试验研究
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摘要
对7个楔形薄腹H型钢短柱进行了在恒定轴力下的拟静力试验,对比分析了其在反复水平荷载作用下的破坏现象、滞回曲线、耗能情况。试验结果分析表明:腹板宽厚比较高的试件延性较差,且板件宽厚比对于构件的影响和初始缺陷密切相关;构件的竖向力对其滞回性能影响较大,应严格控制楔形压弯构件的轴压比。
In steel or composite gable frame construction,steel element with tapered H-seition is often used.The web with high height-thickness ratio is usually applied for tapered H-section members,where local buckling may occur.Seven steel columns with tapered H-section under cyclic loading are examined,in which the local buckling of web plate,hysteretic curves,energy dissipation and failure mode are focused on.Various factors affecting load-carrying capacity and energy dissipation are evaluated.From experimental studies,it is found that the steel members with tapered H-section and high width-thickness ratio web may be less ductile;the hysteretic behavior may be affected by the initial imperfection of the web and the axial force.Some valuable suggestions on using this kind of column for structures in seismic zone were presented.
In steel or composite gable frame construction,steel element with tapered H-seition is often used.The web with high height-thickness ratio is usually applied for tapered H-section members,where local buckling may occur.Seven steel columns with tapered H-section under cyclic loading are examined,in which the local buckling of web plate,hysteretic curves,energy dissipation and failure mode are focused on.Various factors affecting load-carrying capacity and energy dissipation are evaluated.From experimental studies,it is found that the steel members with tapered H-section and high width-thickness ratio web may be less ductile;the hysteretic behavior may be affected by the initial imperfection of the web and the axial force.Some valuable suggestions on using this kind of column for structures in seismic zone were presented.
引文
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[2]Fukumonto Y,Kusama H.Local instability tests ofplate elements under cyclic uniaxial loading[J].Journal of Structural Engineering,1985,111(5):1 051—1 067.
[3]Fukumonto Y,Kusama H.Cyclic behavior of plates in-plane loading[J].Eng.Struct.,1985,(7):56—63.
[4]郝际平.钢结构在循环荷载作用下的局部屈曲、低周疲劳的试验与理论研究[D].西安:西安建筑科技大学,1995.
[5]苏明周.箱形截面钢构件在地震作用下的相关屈曲破坏机理及抗震设计对策[D].西安:西安建筑科技大学,2002.
[6]陈城.变截面宽肢薄腹构件滞回性能的数值分析和实验研究[D].上海:同济大学,2003.
[7]赵静.薄柔截面H形钢构件抗震性能研究[D].上海:同济大学,2004.
[8]乔磊.变截面H型钢柱稳定性能的试验研究与数值分析[D].北京:北京交通大学硕士学位论文,2006.
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